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Mount Prospect, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Mount Prospect IL
National Weather Service Forecast for: Mount Prospect IL
Issued by: National Weather Service Chicago, IL
Updated: 11:06 am CDT Jun 15, 2026
 
Today

Today: Mostly sunny, with a high near 75. West wind 10 to 15 mph, with gusts as high as 20 mph.
Mostly Sunny

Tonight

Tonight: Partly cloudy, with a low around 59. Southwest wind around 10 mph, with gusts as high as 15 mph.
Partly Cloudy

Tuesday

Tuesday: Showers and thunderstorms likely before 4pm, then showers and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm.  High near 74. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.  Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Breezy.
Chance
T-storms then
T-storms
Tuesday
Night
Tuesday Night: A chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am.  Partly cloudy, with a low around 56. West wind 5 to 15 mph, with gusts as high as 25 mph.  Chance of precipitation is 30%.
Chance
Showers

Wednesday

Wednesday: A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. Some of the storms could produce heavy rainfall.  High near 73. Breezy, with a south southeast wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.  Chance of precipitation is 90%.
Chance
Showers then
Heavy Rain
and Breezy
Wednesday
Night
Wednesday Night: Showers and possibly a thunderstorm before 1am, then a slight chance of showers.  Low around 60. Chance of precipitation is 90%.
T-storms then
Showers

Thursday

Thursday: Mostly sunny, with a high near 74.
Mostly Sunny

Thursday
Night
Thursday Night: Partly cloudy, with a low around 56.
Partly Cloudy

Juneteenth

Juneteenth: Sunny, with a high near 75.
Sunny

Hi 75 °F Lo 59 °F Hi 74 °F Lo 56 °F Hi 73 °F Lo 60 °F Hi 74 °F Lo 56 °F Hi 75 °F

 

Today
 
Mostly sunny, with a high near 75. West wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight
 
Partly cloudy, with a low around 59. Southwest wind around 10 mph, with gusts as high as 15 mph.
Tuesday
 
Showers and thunderstorms likely before 4pm, then showers and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. High near 74. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
 
A chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Partly cloudy, with a low around 56. West wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Wednesday
 
A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. Some of the storms could produce heavy rainfall. High near 73. Breezy, with a south southeast wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 90%.
Wednesday Night
 
Showers and possibly a thunderstorm before 1am, then a slight chance of showers. Low around 60. Chance of precipitation is 90%.
Thursday
 
Mostly sunny, with a high near 74.
Thursday Night
 
Partly cloudy, with a low around 56.
Juneteenth
 
Sunny, with a high near 75.
Friday Night
 
Mostly clear, with a low around 58.
Saturday
 
Mostly sunny, with a high near 79.
Saturday Night
 
A chance of showers. Mostly cloudy, with a low around 61.
Sunday
 
A chance of showers. Partly sunny, with a high near 76.

 

Forecast from NOAA-NWS for Mount Prospect IL.

Weather Forecast Discussion
755
FXUS63 KLOT 151123
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
623 AM CDT Mon Jun 15 2026

.KEY MESSAGES...

- Scattered thunderstorms Tuesday with a level 1 for severe
  weather, mainly in the afternoon/early evening.

- Severe thunderstorms Wednesday into Wednesday evening with a
  level 3 for severe weather, with all hazards possible, large
  hail, damaging winds and tornadoes.

- Torrential rainfall and localized flash flooding possible
  Wednesday.

- Possible high waves and dangerous swimming conditions at
  Indiana Lake Michigan beaches Thursday.

&&

.DISCUSSION...
Issued at 225 AM CDT Mon Jun 15 2026

Dry and quiet conditions are expected today with below normal
temps topping out in the mid 70s. Westerly winds will gust into
the 20 mph range.

An upper level trough and associated cold front will move across
the area Tuesday bringing showers and scattered thunderstorms.
There remains some timing differences with activity possibly
into the western cwa Tuesday morning and then strengthening into
the afternoon as it moves across the eastern cwa, likely exiting
the cwa early Tuesday evening. The Day 2 outlook maintains a
level 1 risk for severe weather with moisture/dewpoints being
the limiting factor given current model trends. The NAM does
have a narrow axis of dewpoints in the lower/mid 60s ahead of
the front across northern IN by 00z and if this were to
materialize, there may be a bit higher severe threat in the far
eastern cwa. Prevailing southwest winds ahead of the cold front
may gust into the 30 mph range on Tuesday.

Another stronger upper level trough and associated surface low
will move across the Great Lakes region Wednesday bringing the
threat of severe thunderstorms across much of the region, though
there remains quite a bit of uncertainty for the local area.
There could be ongoing convection midday Wednesday with perhaps
widespread coverage. While there is a chance this could limit
how far north the warm front is able to lift later Wednesday
afternoon into Wednesday evening, the deepening low pressure
that is likely to be north of the area and the strong wind
field may allow the warm front to lift back north through at
least the I-80 corridor and much of the guidance generally
supports the warm front lifting back through at least part of
the local area. Despite these uncertainties, all severe hazards
will be possible Wednesday into Wednesday evening, large hail,
damaging winds and tornadoes, some possibly strong.

Precipitable water values on Wednesday are forecast to be in the
1.5 to 2 inch range across much of the area and the past few
operational runs of the GFS show precipitable water values
across the southern cwa into the 2.25 inch range. Current
forecast qpf amounts for this time period are around 2 inches
for most of the area and if these materialize, combined with the
wet ground and elevated river/creek levels, torrential rain
will lead to localized flash flooding. Too early for a flood
watch but that will need to be considered as Wednesday
approaches.

Prevailing south/southeast winds outside convection Wednesday
may gust into the 30-35 mph range and then shift southwest south
of the warm front. Northwest winds behind the cold front may
also gust into the 30 mph range Wednesday night into Thursday,
but will be dependent on the strengthen/deepening of the system
as it departs. Wind directions may allow for high waves and
dangerous swimming conditions for Indiana Lake Michigan beaches
Thursday.

Quite a bit of uncertainty for the end of the week into next
weekend regarding precip chances. There appears to be a few
weak waves in northwest flow that may allow for some afternoon
showers and thunderstorms Friday and Saturday. And then maybe a
more organized system in the Sunday time frame, which the ECMWF
appears to be fairly consistent with. Temperatures look to
remain slightly below normal through the period. cms

&&

.AVIATION /12Z TAFS THROUGH 18Z TUESDAY/...
Issued at 623 AM CDT Mon Jun 15 2026

Forecast concerns include...

Chance of thunderstorms Tuesday morning.
Gusty southwest winds Tuesday.

Light southwest winds to start will become more west/southwest
by mid morning and increase into the 10-12kt range with gusts
into the 15-20kt by late morning. Winds will diminish under 10kt
with sunset and turn southwest. Speeds and gusts will slowly
begin to increase toward daybreak Tuesday morning and continue
to increase Tuesday morning with gusts into the mid 20kt range.

There will be a chance for showers and thunderstorms Tuesday
morning, mainly after daybreak through mid morning. There
remains uncertainty for both timing and location though there
are some trends in guidance that if thunderstorms occur, this
would be the time period. Despite the low confidence, opted to
include prob thunder mention in the new 30 hour ORD/MDW tafs.
cms

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.

&&

$$

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